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| TROUBLESHOOTING & REPAIR |
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| TROUBLESHOOTING GUIDE | Observe Safety Guidelines | |
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| detailed in the beginning of this manual. | |
| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| TIG MODE PROBLEMS |
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| Black areas along weld bead. | 1. | The tungsten electrode may be | 1. This may be a welding proce- |
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| contaminated. Replace or | dure problem. |
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| sharpen. | Contact The Lincoln Electric |
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| 2. | Shielding gas flow may be | Service Department, (216) 383- |
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| insufficient. | 2531 or |
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| 3. | Contaminated gas or faulty gas |
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| line or torch. |
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| Black areas along weld bead at or | 1. | Increase the gas post flow | 1. This may be a welding proce- |
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| near end of weld. |
| time. | dure problem. |
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| Contact The Lincoln Electric |
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| Service Department, (216) 383- |
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| 2531 or |
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| The machine has low output when | 1. | The machine must be in Local | 1. Contact The Lincoln Electric |
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| in TIG |
| control mode when | Service Department, (216) 383- |
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| used. | 2531 or |
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| 2. | The machine output control | (WELD). |
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| may be set iincorrectly. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
SQUARE WAVE TIG 355
